亚洲av成人精品日韩一区二区-日本50岁成熟丰满熟妇-欧美日韩久久婷婷一区二区-亚洲成人天堂在线观看

Customization of plastic packaging bags is one of the ways we often manufacture products, but what should we pay attention to when manufacturing products? Now let's learn about this knowledge.

We know that the materials used to make products pollute the environment to a certain extent, but this is one of the indispensable things in people's lives, so for our health, we need more formal manufacturers, followed by the materials we choose Must be non-toxic. Nowadays, people use polyethylene and polypropylene to make products. The former is non-toxic and environmentally friendly, while the latter is toxic and harmful and not environmentally friendly, so the scope and purpose of use are similar. You can choose the right material according to your purpose.

We need to choose the size of the product, because we know that the product we make needs to choose the right size and material, and it is welcomed by people, so we need to confirm whether the size is appropriate when we buy the product.